fix(window): WIN11 关闭按钮 hover 红底按圆角裁剪

WIN11 窗口是圆角样式，关闭按钮又紧贴右上角；此前 hover/按下直接
row_fill 整块矩形，红色会盖住窗口圆角外的区域。

- 新增 _window_round_keep：按窗口自身的圆角轮廓判断像素是否可画
- 新增 _close_fill_row：同时按“按钮圆角 + 窗口圆角”双重裁剪
- WIN11 关闭按钮红底向内收 2px、圆角 3px；WIN7/WINXP 也走窗口轮廓裁剪
- 移除不再使用的 _round_fill_row

Apps/Explorer/desk_server.vp

@@ -1044,20 +1044,33 @@ class DeskServer:
             if lx >= bw - r: return _is_in_corner(lx, lry, bw - r - 1, bh - r - 1, r)
         return 1
 
-    # 关闭键底色圆角（WIN7/WINXP 的红色圆角块）：整行只做一次 row_fill
-    def _round_fill_row(self, bx: int, by: int, bw: int, bh: int, yy: int, col: uint32, r: int):
+    # 窗口本身是否允许画在该像素（圆角样式会裁掉四角）
+    def _window_round_keep(self, s: desk.WinSlot*, x: int, y: int) -> int:
+        if s.style != STYLE_WIN11 and s.style != STYLE_WIN7 and s.style != STYLE_WINXP:
+            return 1
+        rx: int = x - s.ux
+        ry: int = y - s.uy
+        if rx < 0 or rx >= s.w or ry < 0 or ry >= s.h: return 0
+        return self._round_keep(rx, ry, s.w, s.h, WIN_RADIUS)
+
+    # 关闭键底色：按钮自身圆角 + 窗口圆角双重裁剪，避免 WIN11 右上角红块溢出
+    def _close_fill_row(self, s: desk.WinSlot*, bx: int, by: int, bw: int, bh: int, yy: int, col: uint32, r: int):
         lry: int = yy - by
         if lry < 0 or lry >= bh: return
         lo: int = 0
-        while lo < bw and self._round_keep(lo, lry, bw, bh, r) == 0:
+        while lo < bw:
+            if self._round_keep(lo, lry, bw, bh, r) != 0 and self._window_round_keep(s, bx + lo, yy) != 0:
+                break
             lo += 1
         hi: int = bw
-        while hi > lo and self._round_keep(hi - 1, lry, bw, bh, r) == 0:
+        while hi > lo:
+            if self._round_keep(hi - 1, lry, bw, bh, r) != 0 and self._window_round_keep(s, bx + hi - 1, yy) != 0:
+                break
             hi -= 1
         if hi > lo:
             self.row_fill(bx + lo, yy, hi - lo, col)
 
-    def _draw_close_row(self, bx: int, by: int, bw: int, bh: int, yy: int, style: int, hovered: int, pressed: int):
+    def _draw_close_row(self, s: desk.WinSlot*, bx: int, by: int, bw: int, bh: int, yy: int, style: int, hovered: int, pressed: int):
         lry: int = yy - by
         if lry < 0 or lry >= bh: return
         cx: int = bx + bw / 2
@@ -1076,7 +1089,7 @@ class DeskServer:
             base_col2: uint32 = self.rgb(uint32(200), uint32(50), uint32(50))
             if hovered != 0: base_col2 = self.rgb(uint32(220), uint32(60), uint32(60))
             if pressed != 0: base_col2 = self.rgb(uint32(140), uint32(25), uint32(25))
-            self._round_fill_row(bx, by, bw, bh, yy, base_col2, 3)
+            self._close_fill_row(s, bx, by, bw, bh, yy, base_col2, 3)
             x_col = self.rgb(uint32(255), uint32(255), uint32(255))
         else:
             x_col = self.rgb(uint32(150), uint32(150), uint32(150))
@@ -1084,7 +1097,11 @@ class DeskServer:
             if active != 0:
                 bg: uint32 = self.rgb(uint32(200), uint32(50), uint32(50))
                 if pressed != 0: bg = self.rgb(uint32(140), uint32(25), uint32(25))
-                self.row_fill(bx, yy, bw, bg)
+                if style == STYLE_WIN11:
+                    # 圆角样式：向内收 2px，按钮自身圆角 + 窗口右上角圆角双重裁剪
+                    self._close_fill_row(s, bx + 2, by + 2, bw - 4, bh - 4, yy, bg, 3)
+                else:
+                    self.row_fill(bx, yy, bw, bg)
                 x_col = self.rgb(uint32(255), uint32(255), uint32(255))
         i: int = yy - cy
         if i >= 0 - d and i <= d:
@@ -1196,7 +1213,7 @@ class DeskServer:
         yend: int = y1
         if yend > by + bh: yend = by + bh
         while yy < yend:
-            self._draw_close_row(close_x, by, bw, bh, yy, style,
+            self._draw_close_row(s, close_x, by, bw, bh, yy, style,
                                  1 if hover_kind == 1 else 0, 1 if pressed_kind == 1 else 0)
             self._draw_min_row(min_x, by, bw, bh, yy, style,
                                1 if hover_kind == 2 else 0, 1 if pressed_kind == 2 else 0)